I was using those of another manufacturer before you buy this product, but Hawatari is I have easily broken long. I checked on the Internet, because it was recommended the item, when I use, was free is spa spa and the hole without breaking at all.

Was used about two after two pack purchase, also be careful to chucking the machine shake out at the time of rotation. Enough to think that if a drill that is warped.
Only Unfortunately there is no problem with the sharpness.

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All of the products MonotaRO Singapore offers are subject to Japanese local laws, regulations, and certification standards.
Please make sure that it may or may not meet requirements of your country and/or international organizations,
including but not limited to, UL Certification, China Compulsory Certificate system, and Halal.
MonotaRO Co.,Ltd. Hyogo Public Safety Commission No.631330800020